Process for purifying waste water

Details Process for purifying waste water Process for purifying waste water

C - Chemistry, Metallurgy

02

F

362/4

C02F 3/28 (2006.01) C02F 3/00 (2006.01) C02F 3/30 (2006.01)

Patent

CA 1324843

Title: A process for purifying waste water. ABSTRACT A process for purifying waste water resulting from the manufacture of chemo- and/or thermomechanical pulp, which comprises subjecting the waste water to at least the following sequence of steps: sedimentation of coarser constituents (4); cooling (6); detoxification (7); anaerobic hydrolysis and preacidification (10) with addition of nutrient salts and readjustment of the redox potential; production of methane in a methane reactor (11); aerobic purification and separation of biologic sludge (12; 13), which is at least partly recycled to the detoxifi- cation step (7), in which process aerobic sludge is separated prior to the anaerobic hydrolysis step (10).

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